A shell and tube type heat exchanger is designed for heating water from 25°C to 50°C with the help of steam condensing at atmospheric pressure. The water flows through tubes (2.5 cm I.D., 2.9 cm O.D....

A shell and tube type heat exchanger is designed for heating water from 25°C to 50°C with the help of steam condensing at atmospheric pressure. The water flows through tubes (2.5 cm I.D., 2.9 cm O.D. and 2 m long) and the steam condenses on the outside. Calculate the number of tubes required if the water flow rate is 500 kg/min and the individual coefficients of heat transfer on the steam and water side are 8000 and 3000 W/ m².K. Neglect all other resistances.